Patent UA-90045-C2 (UA)
Title: Method for excess pressure measurements
Inventor: KONDRATOV VLADYSLAV TYMOFIIOVYCH
IPC: G01L11/00
Filed: 2008-07-25
Abstract: Method for excess pressure measurement is proposed, it is based on formation of directed flow of optical radiation EMBED PBrush 0 is given range of wavelengths, with modulation of power by unknown in value pressure px, with transformation of power of modulated flux of optical radiation EMBED PBrush м to voltage U EMBED PBrush , with its measurement and remembering with following determination of real pressure value px by equation of measurement. According to the invention first power of flux of optical radiation EMBED PBrush 0 is modulated by pressure px, value of which is equal to value of atmospheric pressure pн ({p1} = {pн}), with transformation of power of first modulated flux of optical radiation EMBED PBrush м1 to voltage U EMBED PBrush 1, one measures and remembers it, after that power of flux of optical radiation EMBED PBrush 0 is modulated by pressure p2, value of which is determined by condition {p2} = 0,5{px} + {pн}, one transforms power of second modulated flow of optical radiation EMBED PBrush м2 to voltage U EMBED PBrush 2, with its measurement and determination, after that lower of flux of optical radiation EMBED PBrush 0 is modulated by pressure p3, value of which is determined by condition {p3} = 0,5({px}-{ EMBED Equation.3 p0}) + {pн}, where { EMBED Equation.3 p0} – value of normalized pressure increment one transforms power of third modulated flux of optical radiation EMBED PBrush м3 to voltage U EMBED PBrush 3, with its measurement and remembering, after that power of flux of optical radiation EMBED PBrush 0 is modulated by pressure p4, value of which is determined from condition {p4} = 0,5({px} + { EMBED Equation.3 p0}) + {pн}, one transforms power of fourth modulated flux of optical radiation EMBED PBrush м4 to voltageU EMBED PBrush 4, with its measurement and remembering, after that power of flux of optical radiation EMBED PBrush 0 is modulated by pressure p5, value of which is determined from condition {p5} = 0,5{p0x} + {pн}, where {p0x} – value of normalized pressure that from result of second measurement is set as close to value of pressure px, one transforms power of fifth modulated flux of optical radiation EMBED PBrush м5 to voltage U EMBED PBrush 5, with its measurement and storage, after that power of flux of optical radiation EMBED PBrush 0 is modulated with pressure p6, value of which is determined from condition {p6} = 0,5({p0x}-{ EMBED Equation.3 p0}) + {pн}, power of the six modulated flux of optical radiation EMBED PBrush м6 is transformed to voltage U EMBED PBrush 6, with measuring and remembering it, after that power of flux of optical radiation EMBED PBrush 0 is modulated with pressure p7, value of which is determined by condition {p7} = 0,5({p0x} + { EMBED Equation.3 p0}) + {pн}, with transformation of power of seventh modulated flux of optical radiation EMBED PBrush м7 to voltage U EMBED PBrush 1, with measurement and storing, and real value of unknown pressure px is determined according to equation of excess measurements EMBED Equation.3 where k1 = 1, k2 = 2, EMBED Equation.3